摘要
为了研究电导率各向异性介质中二维大电磁场的变化规律,首先从其满足的变分问题出发,利用有限单元法计算出大地电磁场,借助辅助场获得视电阻率,其次讨论TEz模式下各向异性介质和各向同性介质中视电阻率响应曲线的区别,接着探讨不同层面倾角、不同频率下各向异性异常体引起大地电磁场的变化,另外就高、低阻各向异性介质对大地电磁视电阻率影响的差异进行讨论,最后讨论平行层面和垂直层面的电阻率对各向异性介质平均电阻率的影响,从而获得各向异性大地电磁场响应特征。
The variations of 2-D MT field in anisotropic medium for conductivity were studied in this pa- per. The electromagnetic field was worked out with finite element method （FEM） , and the apparent re- sistivity was obtained with the help of auxiliary field after variational problems in an anisotropic medium were solved. The differences of magnetotelluric field between anisotropic and isotropie media under TEz mode were discussed. Furthermore, the influence of dipping anisotropy and varying frequency was ana- lyzed on the change of MT field. Finally, the characteristics of MT field response in the anisotropic media were obtained after discussing the effects of high resistance and low resistance on MT field and the impact of resistivity parallel to and perpendicular to the strike of structure.
出处
《中山大学学报（自然科学版）》
CAS
CSCD
北大核心
2013年第4期143-148,共6页
Acta Scientiarum Naturalium Universitatis Sunyatseni
基金
国家自然科学基金资助项目(40974077
41164004)
广西自然科学基金资助项目(2011GXNSFA018003
2013GXNSFAA019277)
广西高校优秀人才资助计划项目(桂教人[2010]41号)
桂林理工大学科研启动费联合资助
